Tip: Don't have /var/lib/vz as a symlink

[DaveQB]

I found out the hard way not to have /var/lib/vz as a symlink.

The reason is proxmox loses its ability to report to you the disk usage of a container in the web gui. Vz from the command line could though, so maybe a missing trailing slash in the proxmox code.

So I changed it to a bind mount and all is well now. That saves a desperate reinstall
(I really like know how much a container is using)